Chain saw



FIG. 1 is a right perspective view of the chain saw;

FIG. 2 is a front view of the chain saw shown in FIG. 1;

FIG. 3 is a rear view of the chain saw shown in FIG. 1;

FIG. 4 is a left view of the chain saw shown in FIG. 1;

FIG. 5 is a right side view of the chain saw shown in FIG. 1;

FIG. 6 is a top side view of the chain saw shown in FIG. 1; and,

FIG. 7 is a bottom view of the chain saw shown in FIG. 1.

The broken lines in the drawings illustrate portions of the chain saw and form no part of the claimed design. 

CLAIM I claim the ornamental design for a chain saw, as shown and described. 